Methods and devices for snooping data transfer
OwnerGerardo Castellano, Antonio Giordano +1inventors
InventorsGerardo Castellano, Antonio Giordano, Marcello Raimondi
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Abstract
A method to arm an airbag, the method including determining, by a system device, that an arming condition for the airbag has been met; delivering a communication to a master device from the system device to inform the master device that the arming condition has been met; snooping the communication by an expansion device; and arming the airbag by the expansion device in response to snooping the arming condition.
Claims20
A method to arm an airbag, the method comprising:
- determining, by a system device, that an arming condition for the airbag has been met;
- delivering a communication to a master device from the system device to inform the master device that the arming condition has been met;
- snooping, by an expansion device, the communication from the system device;
- and
- arming the airbag by the expansion device in response to snooping the arming condition.
An airbag-deployment system comprising:
- a master device configured to output a system chip-select signal, output an expansion chip-select signal, output a master-out slave-in (MOSI) signal, and receive a master-in slave-out (MISO) signal;
- a system device comprising,
- a MISO output,
- a chip-select input configured to receive the system chip-select signal originating from the master device, the system chip-select signal enabling communication of the MISO signal from the system device to the master device,
- a sensor interface to receive sensor data, and
- logic circuitry configured to generate an arm command carried on the MISO signal in response to an arm condition being met by the sensor data;
- and
- an expansion device comprising,
- a snooping decoder circuit configured to receive the system chip-select signal originating from the master device and receive the MISO signal, the snooping decoder circuit being enabled by the system chip-select signal,
- a standard decoder circuit configured to receive the expansion chip-select signal originating from the master device and output the MISO signal, the standard decoder circuit being enabled by the expansion chip-select signal, and
- arming logic that receives as input a decoded MISO signal from the snooping decoder circuit and configured to output an arm signal to an airbag driver in response to identifying the arm command carried on the decoded MISO signal.
An expansion device for an airbag-deployment system, the expansion device comprising:
- a snooping decoder circuit configured to receive a slave-device chip-select signal originating from a master device and receive a Master In Slave Out (MISO) signal originating from a slave device, the snooping decoder circuit being enabled by the slave-device chip-select signal;
- a standard decoder circuit configured to receive an expansion chip-select signal originating from the master device and output the MISO signal, the standard decoder circuit being enabled by the expansion chip-select signal;
- and
- arming logic that receives a decoded MISO signal from the snooping decoder circuit and configured to output an arm signal to an airbag driver in response to identifying an arm command carried on the decoded MISO signal.
Dependencies are inferred from the claim text.